AFP isoforms and their clinical significance (overview)

Area of Science:

• Biochemistry
• Oncology
• Clinical Chemistry

Background:

• Alpha-fetoprotein (AFP) is a crucial tumor marker for germ cell tumors (YST) and hepatocellular cancer (HCC).
• AFP's specificity is limited by elevations in benign liver diseases (BLD) and pregnancy.
• Differentiating AFP sources is vital for accurate diagnosis.

Purpose of the Study:

• To explore the utility of AFP lectin binding for differentiating AFP sources and associated diseases.
• To evaluate the effectiveness of specific lectins in distinguishing between various conditions causing AFP elevation.

Main Methods:

• Affinity electrophoresis and chromatography using lectins such as Concanavalin A and Lens culinaris agglutinin (LCA).
• Characterization of AFP reactive patterns using a panel of lectins, including erythroagglutinating E-PHA.
• Review of data on LCA and E-PHA for liver AFP differentiation.

Main Results:

• Successful differentiation of AFP sources and diseases using lectin binding patterns.
• Identification of four distinct reactive patterns corresponding to cord serum/liver/BLD, HCC, gastrointestinal tumors, and YST.
• Demonstrated clinical importance of LCA and E-PHA in differentiating liver AFP.

Conclusions:

• AFP lectin binding analysis is a valuable tool for clarifying unexplained AFP elevations.
• This method aids in distinguishing the origin of AFP and identifying malignancy.
• Lectin-based AFP characterization enhances diagnostic accuracy for liver cancer and other conditions.